ComingSoon.net has posted the weekend box office estimates which show that Thor has reached $392.4 million worldwide so far:

Paramount Pictures and Marvel Studios' Thor fell two spots to third with $15.5 million and has reached $145.4 million domestically after three weeks. Internationally, the comic book adaptation added $9 million to bring its foreign total to $247 million after three weeks. That puts the combined worldwide total at $392.4 million so far.